Depreciation
What a Gap in the Service History Costs at Sale
Buyers say they want 19 per cent off a car with no history. That is the one figure with a method behind it, and it measures an expectation rather than a completed sale.
Search for what a missing service history costs and the answers arrive as confident percentages: 10 to 20, 15 to 25, 20 to 35. Follow them back and almost none carry a method. One figure does. A survey of over 2,000 car owners found that buyers who would still consider a car with no history wanted 19 per cent off to take it on, and nearly half would not consider it at any discount.
The one figure with a method
Kwik Fit surveyed more than 2,000 car owners and published the result on 15 February 2021. Two findings came out of it. Almost half said an incomplete service history was a deal breaker and they would not consider the car. Those who would still buy expected an average discount of 19 per cent for taking on a car with an unknown past.
The article applies that to an average used car price of 7,706 GBP, a figure it dates to July 2014, and reports a seller loss of 1,464 GBP. The arithmetic is exact: 7,706 at 19 per cent is 1,464.14.
Two cautions travel with that number and neither is a reason to discard it. It measures what buyers say they would want, not what cars actually sold for. And the price it is applied to was already close to seven years old when the piece was published, which is a good illustration of how a sourced figure and a stale one can sit in the same sentence.
What the trade says, and how far apart it is
A vehicle data provider published its own summary on 25 October 2018, quoting a buying service that expects to take at least 15 per cent off its offer for a car without history, and states that a car over two years old with no history can be worth as much as 40 per cent less than an equivalent car with a full one.
| Source and basis | Discount | Money on a 200,000 car |
|---|---|---|
| Buying service, minimum taken off an offer | 15 % | 30,000 |
| Survey, average discount buyers expect | 19 % | 38,000 |
| Buying service, car over two years old, no history | up to 40 % | 80,000 |
| Spread between the outer figures | 25 points | 50,000 |
A 50,000 spread on the same question is not a rounding difference. The published range is that wide because the sources are answering three different questions: what a trade buyer opens at, what a private buyer says they want, and what the worst case looks like on an older car. None of them is the number a specific car will lose.
Why this bites harder on a supercar
The percentages above come from the mainstream market. Three things make the same gap more expensive on this class of car.
- The base is larger. A 19 per cent discount is 1,464 GBP on the average used car in the survey and 38,000 on a car at 200,000. The percentage travels, the consequence does not.
- The unverifiable work is expensive work. On a mid engined car the jobs a buyer most wants proof of are the ones priced by what has to be removed to reach them. A missing stamp is not a missing oil change, it is an unanswered question about a five figure item.
- The buyer pool is smaller and better informed. Nearly half of ordinary buyers walk away from a car with no history. On a car with a specialist audience, the proportion who know exactly which record they are looking for is higher, not lower.
What counts as a gap
The published research treats history as present or absent. Real cars sit between, and the distinctions that matter to a valuation are narrower than that:
- Missing invoices, present stamps. A stamp records that a service happened. An invoice records what was done and what was replaced. On an older car the invoices are worth more than the book.
- A gap during storage. Explainable, and only if the storage is evidenced. A car that stood for three years still passed three annual intervals on the calendar.
- A change of workshop. Main dealer to specialist is a documented decision, not a gap, provided the specialist's paperwork exists.
- A gap around a major job. The most expensive kind, because the buyer assumes the work either was not done or was done badly.
Whether it can be rebuilt
Partly, and it is worth doing before a sale rather than during one. Workshops keep records, manufacturers hold service data against the vehicle identification number, and paperwork recovered from a previous keeper closes gaps that the book itself cannot. What cannot be recreated is evidence for work nobody recorded, and a buyer's discount is aimed at exactly that portion.
The practical conclusion is not a percentage, because the honest range is 15 to 40 and no source narrows it for a specific car. It is that the cost of documenting work is always smaller than the discount applied for its absence, and it is spent while there is still time.
Questions readers ask
How much does missing service history reduce a car's value?
The one surveyed figure is 19 per cent, the average discount buyers said they would want, from a survey of over 2,000 car owners published on 15 February 2021. Trade sources quote at least 15 per cent off an offer and up to 40 per cent on a car over two years old with no history.
Which of those figures should I use?
None as a prediction. They answer different questions: a trade opening position, a stated buyer expectation and a worst case. On a 200,000 car the range runs from 30,000 to 80,000, which is a 50,000 spread on the same question.
Will buyers reject the car outright?
Nearly half said they would. In the survey, almost half of more than 2,000 owners described an incomplete history as a deal breaker rather than a price negotiation.
Are stamps or invoices worth more?
Invoices, particularly on an older car. A stamp records that a service happened. An invoice records what was done and what was replaced, which is the question a buyer is actually pricing.
Can a service history be rebuilt?
Partly. Workshops keep their own records, manufacturers hold data against the vehicle identification number and a previous keeper may still have paperwork. Work that nobody documented cannot be recovered, and that is the portion the discount is aimed at.
Does a specialist history hurt against a main dealer one?
Not by itself, provided the specialist's paperwork exists and is complete. What buyers discount is an unanswered question, not a change of workshop.
Sources
- Kwik Fit, would you buy a car without a full service history, published 15 February 2021, for the survey of over 2,000 owners, the 19 per cent average expected discount and the 7,706 GBP average price it is applied to.
- HPI, the value of a service history, published 25 October 2018, for the trade figures of at least 15 per cent off an offer and up to 40 per cent on an older car with no history.